Digital BW, The Print

First off, if my question has been addressed previously (ad 
nauseum…), please just direct me to the appropriate thread. 

I am currently using a 1280 running a NoMoreCarts CIS with the 
Piezography driver and Cone's PiezoTone Warm-Neutral inks. I want to 
get cooler results and like the sample I just received from IJM of 
their Selenium inkset. Alas, I was told (by IJM) that I have to 
abandon my current CIS because the Warm-Neutral and the Selenium 
inks are not compatible. Is this the experience of list members? 
What makes this seem curious to me is that MIS claims I can drop the 
feed tubes from my current CIS into their ink bottles, run the 
appropriate number of purging sheets through the printer, and I'm 
back in business. So MIS inks are compatible but Cone's own inks 
aren't?? I certainly don't want to cause any head clogging or other 
problems with my Epson, but I'd sure like to avoid paying another 
couple hundred bucks for a new CIS. Any advice?
BJM